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2004 E320
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Discussion Starter #1
when I turn on the front window defroster, the fan will kick on high for a couple of seconds and shut off. I have to turn the climate control off for about a minute or two and it starts working again. If I adjust the fan down from full it works properly. This happens in the winter only. any suggestions?
 

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I'm not familiar with this year/model so take others' advice over mine, however, I had a similar problem with my w124. It turned out to be a hairline crack in the fusible link for the blower motor. Usually it worked fine, but occasionally it would just stop.

My best guess is that the blower in your car has some sort of circuit breaker that shuts it off when it draws too much power (on high). The breaker is probably just too sensitive, but it's also possible that there's something wrong with the blower motor (drawing more energy). It could also be a fuse or fusible link, like in mine. Or something completely different...
 
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